Note 8 - Disclosures about Fair Value of Assets and Liabilities (Details) - Fair Value of Financial Instruments (USD $)	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2012
Financial assets:
Financial Assets - Carrying Amount	$ 49,242,713	$ 12,303,200	$ 42,694,971	$ 41,663,405
Financial Assets - Carrying Amount	74,483	79,162
Financial Assets - Carrying Amount	2,836,900	2,885,100
Financial Assets - Carrying Amount	550,430	623,432
Financial Assets - Carrying Amount	446,214,333	464,379,854
Financial liabilities:
Financial Liabilities - Carrying Amount	491,400,718	487,318,939
Financial Liabilities - Carrying Amount	10,000,000	10,000,000
Financial Liabilities - Carrying Amount	15,465,000	15,465,000
Financial Liabilities - Carrying Amount	235,270	250,361
Financial Liabilities - Fair Value	235,270	250,361
Fair Value, Inputs, Level 1 [Member]
Financial assets:
Financial Assets - Carrying Amount	49,242,713	12,303,200
Financial Assets - Fair Value	49,242,713	12,303,200
Fair Value, Inputs, Level 2 [Member]
Financial assets:
Financial Assets - Carrying Amount	74,483	79,162
Financial Assets - Fair Value	76,266	81,089
Financial Assets - Carrying Amount	2,836,900	2,885,100
Financial Assets - Fair Value	2,836,900	2,885,100
Financial Assets - Carrying Amount	550,430	623,432
Financial Assets - Fair Value	550,430	623,432
Financial Assets - Carrying Amount	1,663,331	1,852,641
Financial Assets - Fair Value	1,663,331	1,852,641
Financial liabilities:
Financial Liabilities - Carrying Amount	491,400,718	487,318,939
Financial Liabilities - Fair Value	481,628,543	476,503,513
Financial Liabilities - Carrying Amount	52,350,000	55,350,000
Financial Liabilities - Fair Value	54,416,600	57,185,083
Financial Liabilities - Carrying Amount	10,000,000	10,000,000
Financial Liabilities - Fair Value	10,528,208	7,978,555
Financial Liabilities - Carrying Amount	235,270	250,361
Financial Liabilities - Fair Value	235,270	250,361
Fair Value, Inputs, Level 3 [Member]
Financial assets:
Financial Assets - Carrying Amount	446,214,333	464,379,854
Financial Assets - Fair Value	447,800,778	466,057,001
Financial liabilities:
Financial Liabilities - Carrying Amount	15,465,000	15,465,000
Financial Liabilities - Fair Value	$ 15,465,000	$ 15,465,000